====== Argonaut Model 509 ======
{{509.jpg?150|}}

===== Description =====
  *Five bands, 3.5 - 30 MHz
  *SSB & CW modes
  *Fully solid state
  *Permeability tuning
  *Instant break-in
  *Instant band change
  *Built-in SWR bridge
  *S-Meter
  *WWV
  *Internal speaker
  *Direct frequency readout
  *Receiver offset tuning
  *Five watts input
  *Automatic sideband selection
  *Plug-in circuit boards
  *1/2 uV receiver sensitivity
  *12 - 14 VDC or AC pack power
  *Size: HWD 4.5" x 13" x 7"
  *Weight: 6 lbs








===== Related Links =====
  *[[https://web.archive.org/web/20101003061948/http://www.earlandrews.com/ARGONAUT1.html|VE3AB'​s Argonaut Pages]]



===== Mods & Tips =====
  *[[509_30m|Add 30m Mod]]
  *[[509dialstring|Dial String Replacement Alternative]]
  *[[http://www.k9ew.us/509_crystal_filter.htm|Adding a Crystal Filter]]
  *[[http://www.w1hue.us/Articles/TT_KEY.html|Cleaner Keying]] for the Ten-Tec 509 by W1HUE
  *[[http://www.w1hue.us/Articles/TT_SSB.html|Improving SSB Performance]] of the Ten-Tec Argonaut 509 by W1HUE
  *[[http://www.w1hue.us/Articles/TT_NOISE.html|Curing VHF Interference]] in Ten-Tec Argonauts by W1HUE

===== Accessories =====
  *Antenna Tuner Model [[205]]
  *100 kHz Crystal Calibrator Model [[206]]
  *CW Filter Model [[208]]
  *One Ampere Power Supply Model [[210]]
  *Ceramic Microphone Model [[215]]P
  *Keyer Model [[KR5A]]


===== Specifications =====

==== Receiver ====
  ***Sensitivity:** Less than 0.5 uV for 10 db signal-plus-noise-to noise ratio.
  ***Selectivity:** 2.4 kHz at 6 db down. 1.7:1 shape factor 6/50 db.
  ***Input:** Low impedance unbalanced coaxial input.
  ***Output Impedance:** 8 ohm speaker or headphones. (High or low impedance headphones can be used.)
  ***Spurious Response:** More than 50 db down.
  ***Automatic Gain Control:** (Max) For 100 db change in input signal level, output changes less than 6 db.
  ***Offset Tuning:** With pull-out defeat switch.


==== Transmitter ====
  ***DC Power Input:** 5 watts PEP; 5 watts CW.
  ***RF Power Output:** 2 watts (50 ohm non-reactive load), miniumu.
  ***Output Impedance:** 50 to 75 ohms.
  ***Transmit-Receive Operation:** SSB: PTT. CW: Complete break-in.
  ***CW Sidetone:** Internally switched.  Operates in CW mode.
  ***Microphone Input:** High impedance.  Crystal, ceramic, or dynamic.
  ***Carrier Suppression:** 40 db from single tone output.
  ***Sideband Suppression:** 30 db down from a single tone output at 1000 Hz reference.



==== General ====
  ***Frequency Coverage:** 3.5 to 4.0, 7.0 to 7.5, 14.0 to 14.5, 21.0 to 21.5, 28.0 to 30.0 MHz.
  ***Frequency Stability:** Less than 100 Hz change from 10.5 to 14 VDC.
  ***Modes of Operation:** Normal sideband, reverse sideband, CW.
  ***Dial Calibration:** +/- 5 kHz on 80 through 15 meters, +/- 10 kHz on 10 meters.
  ***Tuning Rate:** Approximately 25 kHz per knob revolution, 80 meters through 15 meters.  100 kHz on 10 meters.
  ***Front Panel Controls:** Resonate. Offset (pull-off). Band Selector. Tuning Knob. RF Gain. AF Gain/Power On-Off. Mode Switch. Meter Switch. Drive.
  ***Rear Apron Connectors:** Antenna. Dial light switch. Microphone jack. Headphone/speaker jack. Receiver antenna. Auxilliary 12 V output jack. Key jack. Power in jack. Receive/Transmit antenna switch. Accessories socket.
  ***Semiconductor Devices:** 32 Transistors, 3 Mosfets, 3 I.C.'s, and 18 Diodes.